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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) (Subsequent Event [Member], USD $) | 0 Months Ended |
--- | --- | ---
Apr. 14, 2015 | Apr. 14, 2015
Subsequent Event [Line Items] |  |
Distribution per Common Share | $ 0.12 us-gaap_DividendsPayableAmountPerShare | $ 0.12 us-gaap_DividendsPayableAmountPerShare
Dividend Period One [Member] |  |
Subsequent Event [Line Items] |  |
Record Date | Apr. 24, 2015 |
Payment Date | May 05, 2015 |
Distribution per Common Share | $ 0.04 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = land_DividendPeriodOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 0.04 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = land_DividendPeriodOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividend Period Two [Member] |  |
Subsequent Event [Line Items] |  |
Record Date | May 19, 2015 |
Payment Date | May 29, 2015 |
Distribution per Common Share | $ 0.04 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = land_DividendPeriodTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 0.04 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = land_DividendPeriodTwoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividend Period Three [Member] |  |
Subsequent Event [Line Items] |  |
Record Date | Jun. 19, 2015 |
Payment Date | Jun. 30, 2015 |
Distribution per Common Share | $ 0.04 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = land_DividendPeriodThreeMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 0.04 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = land_DividendPeriodThreeMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration